/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/ListUtilityFunctions.h
Returns the index of the last Scalar in Scalar List. If Scalar List is empty or invalid, the value -1 will be returned
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="GeometryScript|ListUtils", Meta=(ScriptMethod)) static int GetScalarListLastIndex ( [FGeometryScriptScalarList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptScalarList) ScalarList )